Hypothetically, what would you do if someone in your unit refused to salute the flag or stand during the national anthem, to protest racism?

That's the COA of choice Major. Some things are just sacred, for lack of better word. I like the idea 1SG Chavaree posted below of having them on the Morning and Evening Colors Detail for a good while also. If there's a cemetery nearby ensure they place flags on Veteran's graves and anything else to make them reflect and correct. Too many flag draped coffins to let it just pass.

I had same suggestion .Although in my sitrep I'd tell to stand fast on the side and after we both go have a counseling session with their duty NCO, myself,1st Sg and Cmdr... (I'm AF so it may be handled slightly different).

every single day

Is this punishable under UCMJ?

SSG Carlos Madden - yes, it is punishable, but I've always found that my senior NCOs had ways of handling these type of infractions way more efficiently than I could do by Art. 15 or by special court-martial.

Capt Gregory Prickett - Rock on (cheers) to the NCOs.